五年级英语作文寒假计划30字
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五年级英语作文寒假计划30字
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1） I want to continue with my study,i think study is a life process,so no matter what the situation I am in,i will look for chances to continue it.I have bought several new books ,including those boo...
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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